EP 1489605 A1 20041222 - OPTICAL PICKUP
Title (en)
OPTICAL PICKUP
Title (de)
OPTISCHER ABNEHMER
Title (fr)
CAPTEUR OPTIQUE
Publication
Application
Priority
- JP 0303660 W 20030325
- JP 2002083799 A 20020325
Abstract (en)
The optical pickup of this invention includes a diffraction grating for dividing a light beam emitted from a semiconductor laser into a main beam, a precedent sub beam and a subsequent sub beam; a hologram element for dividing reflected light beams of the main beam, the precedent sub beam and the subsequent sub beam from an optical recording medium respectively into first through eighth main beams, first through eighth precedent sub beams and first through eighth subsequent sub beams; a main beam detector for receiving the first through eighth main beams; a precedent sub beam detector for receiving the first through eighth precedent sub beams; and a subsequent sub beam detector for receiving the first through eighth subsequent sub beams. <IMAGE>
IPC 1-7
IPC 8 full level
G11B 7/09 (2006.01); G11B 7/123 (2012.01); G11B 7/13 (2006.01); G11B 7/131 (2012.01); G11B 7/1353 (2012.01)
CPC (source: EP KR US)
G11B 7/09 (2013.01 - KR); G11B 7/123 (2013.01 - EP US); G11B 7/131 (2013.01 - EP KR US); G11B 7/1353 (2013.01 - EP KR US); G11B 7/0906 (2013.01 - EP US); G11B 7/0912 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR
DOCDB simple family (publication)
US 2003178548 A1 20030925; US 7057146 B2 20060606; CN 1286098 C 20061122; CN 1643584 A 20050720; EP 1489605 A1 20041222; JP 2003281749 A 20031003; KR 20040090967 A 20041027; TW 200306552 A 20031116; TW I268502 B 20061211; WO 03081582 A1 20031002
DOCDB simple family (application)
US 39001103 A 20030318; CN 03805974 A 20030325; EP 03712945 A 20030325; JP 0303660 W 20030325; JP 2002083799 A 20020325; KR 20047010561 A 20030325; TW 92106176 A 20030320